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Allowance for Losses on Loans - Loans Evaluated for Impairment (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 132,513	$ 131,534	$ 131,165	$ 129,257
Recorded Investment of Loans	13,404,413	13,312,388
Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	132,253	131,095
Recorded Investment of Loans	$ 12,059,764	$ 12,076,622
Ratio	1.10%	1.10%
Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 260	$ 439
Recorded Investment of Loans	$ 32,367	$ 34,425
Ratio	0.80%	1.30%
Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 30,700	$ 30,988	31,484	33,033
Recorded Investment of Loans	5,702,071	5,835,194
Single-family residential | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	30,700	30,988
Recorded Investment of Loans	$ 5,686,482	$ 5,822,200
Ratio	0.50%	0.50%
Single-family residential | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 0	$ 0
Recorded Investment of Loans	$ 19,993	$ 17,978
Ratio	0.00%	0.00%
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 32,292	$ 32,304	31,463	31,317
Recorded Investment of Loans	2,174,313	2,038,052
Construction | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	32,292	32,304
Recorded Investment of Loans	$ 1,189,457	$ 1,164,889
Ratio	2.70%	2.80%
Construction | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 0	$ 0
Recorded Investment of Loans	$ 0	$ 0
Ratio	0.00%	0.00%
Construction - custom
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 1,399	$ 1,369	1,926	1,842
Recorded Investment of Loans	538,234	540,741
Construction - custom | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	1,399	1,369
Recorded Investment of Loans	$ 259,944	$ 255,505
Ratio	0.50%	0.50%
Construction - custom | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 0	$ 0
Recorded Investment of Loans	$ 0	$ 0
Ratio	0.00%	0.00%
Land - acquisition & development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 8,746	$ 9,155	9,156	7,978
Recorded Investment of Loans	203,043	204,107
Land - acquisition & development | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	8,731	9,135
Recorded Investment of Loans	$ 153,856	$ 160,964
Ratio	5.70%	5.70%
Land - acquisition & development | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 15	$ 20
Recorded Investment of Loans	$ 86	$ 230
Ratio	17.40%	8.70%
Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 2,090	$ 2,143	2,144	2,164
Recorded Investment of Loans	97,097	99,694
Land - consumer lot loans | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	2,090	2,143
Recorded Investment of Loans	$ 93,272	$ 95,574
Ratio	2.20%	2.20%
Land - consumer lot loans | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 0	$ 0
Recorded Investment of Loans	$ 295	$ 375
Ratio	0.00%	0.00%
Multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 7,404	$ 7,391	7,884	8,329
Recorded Investment of Loans	1,436,715	1,422,674
Multi-family | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	7,403	7,387
Recorded Investment of Loans	$ 1,436,313	$ 1,422,266
Ratio	0.50%	0.50%
Multi-family | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 1	$ 4
Recorded Investment of Loans	$ 380	$ 385
Ratio	0.30%	1.00%
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 13,035	$ 13,170	12,711	11,852
Recorded Investment of Loans	1,643,099	1,631,170
Commercial real estate | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	12,861	12,847
Recorded Investment of Loans	$ 1,632,612	$ 1,618,406
Ratio	0.80%	0.80%
Commercial real estate | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 174	$ 323
Recorded Investment of Loans	$ 10,487	$ 12,765
Ratio	1.70%	2.50%
Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 33,540	$ 31,450	30,279	28,702
Recorded Investment of Loans	1,352,738	1,268,695
Commercial & industrial | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	33,470	31,358
Recorded Investment of Loans	$ 1,352,116	$ 1,266,913
Ratio	2.50%	2.50%
Commercial & industrial | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 70	$ 92
Recorded Investment of Loans	$ 641	$ 1,805
Ratio	10.90%	5.10%
HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 1,104	$ 1,103	1,064	781
Recorded Investment of Loans	141,274	142,178
HELOC | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	1,104	1,103
Recorded Investment of Loans	$ 139,963	$ 140,378
Ratio	0.80%	0.80%
HELOC | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 0	$ 0
Recorded Investment of Loans	$ 483	$ 837
Ratio	0.00%	0.00%
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 2,203	$ 2,461	$ 3,054	$ 3,259
Recorded Investment of Loans	115,829	129,883
Consumer | Loans Collectively Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	2,203	2,461
Recorded Investment of Loans	$ 115,749	$ 129,527
Ratio	1.90%	1.90%
Consumer | Loans Individually Evaluated for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance Allocation	$ 0	$ 0
Recorded Investment of Loans	$ 2	$ 50
Ratio	0.00%	0.00%

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

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Allowance as a Percentage of Outstanding Loans and Leases

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